Species play essential roles in ecosystems, so local and global ... such that as the number of species in the community goes up, the average population sizes of the species in the community ...

A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.

We also operate extensive captive breeding programs to restore endangered populations and conduct reintroduction efforts to establish species back into the wild. Smithsonian researchers study the ...

From a beautiful fish that’s eating the Caribbean to a tiny bivalve with a huge impact, North America’s most notorious introduced species have reshaped the continent’s ecosystems ...

The development of agriculture led to a population explosion that has accelerated enormously during the past 500 years. Unlike other species, humans can adapt to and survive in almost all ...

“This process essentially looks at the rate of genetic mutations as a guide for a species' evolutionary history,” said Corso. “We hypothesize that a population of dragonfishes may have ...